Solar System
Dynamics &
Planetology
Group 		C/1986 P1-A Wilson


SSDP Cometary Note C1986P1N1-001

Comet C/1986 P1-A Wilson

number of observations 688
number of residuals 1361
data interval 1986 Aug. 5 — 1989 Apr. 11
rms [arcsec] 1.11
orbit quality class 1a

Osculating orbital elements (heliocentric; ecliptic J2000.0)

Epoch (TT) 19870505.0 = JD 2446920.5
time of perihelion passage (TT) 19870420.780693 ± 0.000054
perihelion distance 1.19965105 ± 0.00000087
eccentricity 1.00031319 ± 0.00000315
argument of perihelion [deg] 238.307145 ± 0.000054
longitude of the ascending node [deg] 111.666056 ± 0.000041
inclination [deg] 147.119122 ± 0.000029
inverse semimajor axis [10-6 au-1] -261.07 ± 2.63

Nongravitational parameters [10-8 au/day2] A1 = 1.7501 ± 0.0600 A2 = 0.0033 ± 0.0271 A3 = 0.0 (asummed)

Note: Epoch is given in a format: yyyymmdd.d, time of perihelion passage in a format of yyyymmdd.dddddd.

Original orbital elements (barycentric; at 250 au from the Sun)

Epoch (TT) 16880511
time of perihelion passage (TT) 19870420.100152 ± 0.000097
perihelion distance 1.19367382 ± 0.00000163
eccentricity 0.99994987 ± 0.00000235
argument of perihelion [deg] 238.187130 ± 0.000103
longitude of the ascending node [deg] 111.413536 ± 0.000041
inclination [deg] 147.182259 ± 0.000028
inverse semimajor axis [10-6 au-1] 42.00 ± 1.97

Note: Values of uncertainties of original/future orbital elements were derived using a swarm of 5001 osculating orbits of VCs (including the nominal osculating orbit given above) for original/future orbital evolution calclulations and then by fitting the distribution of a given orbital element of original/future swarm of VCs to Gaussian distribution.

Original barycentric positions and velocities of 5001 VCs at 250 au from the Sun are given here   (data format), i.e. before entering the planetary zone.

Future orbital elements (barycentric; at 250 au from the Sun)

Epoch (TT) 22941111
time of perihelion passage (TT) 19870419.783953 ± 0.000120
perihelion distance 1.20210995 ± 0.00000173
eccentricity 0.99907772 ± 0.00000282
argument of perihelion [deg] 238.307237 ± 0.000142
longitude of the ascending node [deg] 111.721429 ± 0.000040
inclination [deg] 147.193160 ± 0.000028
inverse semimajor axis [10-6 au-1] 767.22 ± 2.35


Future barycentric positions and velocities of 5001 VCs at 250 au from the Sun are given here   (data format), i.e. after leaving the planetary zone.





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